Looks like Nanni has buttons 3 and 4 mapped to one key. Probably buttons 1 and 2 as well, but that is used much less frequently.

Due to some single presses of buttons 3 and 4, I cannot be 100% certain this is so. Just 99.99999% He does hit the buttons at the exact same time far too consistently. And this is far more of an issue with fighters than it was with Detana!! Twinbee.